March 1985
Volume 26, Issue 3
Articles  |   March 1985
Preferential-looking assessment of fusion and stereopsis in infants aged 1-6 months.
Investigative Ophthalmology & Visual Science March 1985, Vol.26, 366-370. doi:
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      E E Birch, S Shimojo, R Held; Preferential-looking assessment of fusion and stereopsis in infants aged 1-6 months.. Invest. Ophthalmol. Vis. Sci. 1985;26(3):366-370.

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      © ARVO (1962-2015); The Authors (2016-present)

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The ability of infants to discriminate zero-disparity stimuli from both reverse contrast (rivalrous) and disparate (stereoscopic) stimuli was investigated in a two-alternative, forced-choice, preferential-looking paradigm. Few infants under 4 months of age demonstrated discrimination for any stimulus pairing. Of the infants tested at 4 months of age, approximately 70% preferred zero-disparity stimuli to reverse contrast stimuli, and 82% preferred stereoscopic stimuli to zero-disparity stimuli. Nearly 100% of 5- and 6-month-old infants exhibited these preferences. These findings suggest that sensory fusion is not present at birth but develops rapidly over the first 6 months of life. The time course for the development of sensory fusion was similar to the time course for the development of stereopsis in nine infants tested longitudinally.


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